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Calculator Example with "Design" - View Source header.inc.php | footer.inc.php | examples.css | calculator_3.php | calculator_3.tpl.php |
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<?php
require(dirname(__FILE__) . '/../_require_prepend.inc.php');
require(__INCLUDES__ . '/examples/examples.inc.php');
class CalculatorForm extends ExamplesBaseForm {
// Our Calculator needs 2 Textboxes (one for each operand)
// A listbox of operations to choose from
// A button to execute the calculation
// And a label to output the result
protected $txtValue1;
protected $txtValue2;
protected $lstOperation;
protected $btnCalculate;
protected $lblResult;
// Define all the QContrtol objects for our Calculator
// Add Names to the Controls so that our RenderWithName method can display it
// Randomly add properties both here and in the HTML file to show how to change
// the design/appearance of these controls
protected function Form_Create() {
$this->txtValue1 = new QIntegerTextBox($this);
$this->txtValue1->Required = true;
$this->txtValue1->Name = 'Value 1';
$this->txtValue1->BackColor = 'pink';
$this->txtValue2 = new QIntegerTextBox($this);
$this->txtValue2->Required = true;
$this->txtValue2->Name = 'Value 2';
$this->txtValue2->ForeColor = '#0000cc';
$this->lstOperation = new QListBox($this);
$this->lstOperation->Name = 'Operation';
$this->lstOperation->AddItem('+', 'add');
$this->lstOperation->AddItem('-', 'subtract');
$this->lstOperation->AddItem('*', 'multiply');
$this->lstOperation->AddItem('/', 'divide');
$this->btnCalculate = new QButton($this);
$this->btnCalculate->Text = 'Calculate';
$this->btnCalculate->AddAction(new QClickEvent(), new QServerAction('btnCalculate_Click'));
$this->btnCalculate->CausesValidation = true;
$this->lblResult = new QLabel($this);
$this->lblResult->HtmlEntities = false;
}
protected function Form_Load() {
// Let's always clear the Result label
$this->lblResult->Text = '';
}
protected function Form_Validate() {
// If we are Dividing and if the divisor is 0, then this is not valid
if (($this->lstOperation->SelectedValue == 'divide') &&
($this->txtValue2->Text == 0)) {
$this->txtValue2->Warning = 'Cannot Divide by Zero';
return false;
}
// If we're here, then the custom Form validation rule validated properly
return true;
}
// Perform the necessary operations on the operands, and output the value to the lblResult
protected function btnCalculate_Click($strFormId, $strControlId, $strParameter) {
switch ($this->lstOperation->SelectedValue) {
case 'add':
$mixResult = $this->txtValue1->Text + $this->txtValue2->Text;
break;
case 'subtract':
$mixResult = $this->txtValue1->Text - $this->txtValue2->Text;
break;
case 'multiply':
$mixResult = $this->txtValue1->Text * $this->txtValue2->Text;
break;
case 'divide':
$mixResult = $this->txtValue1->Text / $this->txtValue2->Text;
break;
default:
throw new Exception('Invalid Action');
}
if (isset($mixResult))
$this->lblResult->Text = '<b>Your Result:</b> ' . $mixResult;
}
}
// And now run our defined form
CalculatorForm::Run('CalculatorForm');
?>